US9975287B2 - Strain relief for connector and cable interconnection - Google Patents

Strain relief for connector and cable interconnection Download PDF

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Publication number
US9975287B2
US9975287B2 US14/661,483 US201514661483A US9975287B2 US 9975287 B2 US9975287 B2 US 9975287B2 US 201514661483 A US201514661483 A US 201514661483A US 9975287 B2 US9975287 B2 US 9975287B2
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outer conductor
connector
interconnection
coaxial cable
polymer material
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US20150190954A1 (en
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Jeffrey D Paynter
Kendrick Van Swearingen
James J Carlock
James P Fleming
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CommScope Technologies LLC
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CommScope Technologies LLC
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Priority to US13/251,341 priority Critical patent/US9108348B2/en
Priority to US13/633,218 priority patent/US9024191B2/en
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Priority to US14/661,483 priority patent/US9975287B2/en
Assigned to COMMSCOPE TECHNOLOGIES LLC reassignment COMMSCOPE TECHNOLOGIES LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARLOCK, JAMES J., FLEMING, JAMES P., PAYNTER, JEFFREY D., VAN SWEARINGEN, KENDRICK
Publication of US20150190954A1 publication Critical patent/US20150190954A1/en
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Assigned to ALLEN TELECOM LLC, COMMSCOPE TECHNOLOGIES LLC, REDWOOD SYSTEMS, INC., COMMSCOPE, INC. OF NORTH CAROLINA reassignment ALLEN TELECOM LLC RELEASE OF SECURITY INTEREST PATENTS (RELEASES RF 036201/0283) Assignors: WILMINGTON TRUST, NATIONAL ASSOCIATION
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14549Coating rod-like, wire-like or belt-like articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14311Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14467Joining articles or parts of a single article
    • B29C45/14491Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14598Coating tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/5845Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable the strain relief being achieved by molding parts around cable and connections
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/34Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462Cables
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/34Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3493Moulded interconnect devices, i.e. moulded articles provided with integrated circuit traces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/707Cables, i.e. two or more filaments combined together, e.g. ropes, cords, strings, yarns
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/56Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency specially adapted to a specific shape of cables, e.g. corrugated cables, twisted pair cables, cables with two screens or hollow cables
    • H01R24/564Corrugated cables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/02Soldered or welded connections
    • H01R4/028Soldered or welded connections comprising means for preventing flowing or wicking of solder or flux in parts not desired

Abstract

A strain relief for a coaxial cable and coaxial connector interconnection is provided as an injection moldable polymer material surrounding the interconnection. The injection moldable material fills a solder pre-form cavity between an outer conductor of the coaxial cable and an inner diameter of a bore of the connector body, strengthening and environmentally sealing the interconnection. Where the outer conductor is corrugated, the polymer material may be provided covering an exposed portion of the corrugations and/or filling portions of a corrugation trough between an outer jacket and the outer diameter of the outer conductor.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

This invention relates to a strain relief for a coaxial RF connector. More specifically, the invention relates to a strain relief moldable about a corrugated outer conductor cable to connector interconnection, providing sealing and strength characteristics which enhance the coaxial connector to coaxial cable interconnection.

Description of Related Art

Coaxial cables and coaxial connectors are used, for example, in communication systems requiring a high level of precision and reliability. To create a cost efficient electro-mechanical interconnection between the coaxial cable and the coaxial connector, it is often desirable to interconnect the cable and connector via soldering.

Solder pre-forms may be utilized to improve interconnection quality when soldering coaxial connectors to coaxial cables. The use of a solder pre-form standardizes the location and amount of solder applied. Representative of this technology is commonly owned U.S. Pat. No. 5,802,710 issued Sep. 8, 1998 to Bufanda et al (Bufanda). Bufanda discloses a solder pre-form with a planar connector side (outer surface) and a cable side (inner surface) dimensioned to key with corrugations of an annular corrugated outer conductor. Other solder pre-forms, for example for soldering a coaxial connector with a smooth sidewall outer conductor coaxial cable, have been provided as a plurality of annular rings and/or a cylindrical tube. For ease of assembly prior to soldering, the solder pre-forms typically fit loosely within a desired interconnection area solder cavity formed between the connector body and the outer conductor.

Connector to cable interconnection soldering is typically performed with the connector and coaxial cable vertically oriented, for example as disclosed in U.S. Pat. No. 7,900,344 issued Mar. 8, 2011 to Ng, et al. Thereby, when heat is applied to the solder pre-form during the solder process, the solder liquefies and pools in the bottom of the interconnection area solder cavity. The solder pooling leaves an annular solder pre-form cavity between the outer conductor and the connector body that extends to the cable end of the connector body.

Coaxial cables may utilize aluminum material, for example to realize a cost of materials and/or weight savings advantage. However, use of aluminum may also introduce the disadvantages of reduced strength and/or bending resilience. Aluminum material exposed to air quickly oxidizes, forming an aluminum oxide coating that interferes with solder bonding. Special aluminum material specific soldering flux with a heat activated high acid content may be used to prepare aluminum material surfaces for soldering. However, such flux may be difficult to apply evenly within the interconnection area.

Heat shrink tubing has been utilized as a cosmetic and/or strain relief improvement for connector to coaxial cable terminations. However, heat shrink tubing may provide only a limited environmental seal that may allow moisture ingress/condensation which then pools under the heat shrink tubing, directly upon the interconnection.

Therefore, it is an object of the invention to provide an apparatus and method of manufacture that overcomes deficiencies in such prior art.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the principles of the invention.

FIG. 1 is a schematic partial cut-away view of a coaxial connector to coaxial cable solder interconnection.

FIG. 2 is a schematic partial cut-away side view of the coaxial connector to coaxial cable solder interconnection of FIG. 1 with an exemplary strain relief applied.

FIG. 3 is a schematic isometric view of FIG. 2, with a partial cut-away portion to clarify details of the strain relief.

FIG. 4 is a close-up of area A of FIG. 3.

FIG. 5 is a schematic isometric cut-away end view of the coaxial connector to coaxial cable solder interconnection of FIG. 2, demonstrating a partial cross section of the interconnection area, with the connector body removed for clarity of understanding potential cavity and/or channel defects of the solder joint.

FIG. 6 is a schematic isometric view of the connector body of the coaxial connector of FIG. 1.

FIG. 7 is a schematic isometric cut-away view of a coaxial connector to annular corrugated coaxial cable solder interconnection.

FIG. 8 is a close-up of area D of FIG. 7.

FIG. 9 is a schematic isometric cut-away view of a coaxial connector to helical corrugated coaxial cable solder interconnection.

FIG. 10 is a close-up of area B of FIG. 9.

FIG. 11 is an isometric view of the interconnection of FIG. 7.

DETAILED DESCRIPTION

The inventor has recognized that solder interconnections between coaxial connectors and coaxial cables, particularly where coaxial cables with aluminum material outer conductors are utilized, may have significant strength deficiencies due to the relative strength and resilience of aluminum outer conductors compared to the prior copper material outer conductors. Further, because the specialized flux used in preparation for soldering aluminum material is difficult to apply smoothly, an excess of flux may be applied, resulting in flux residue at the completion of the solder operation that then requires additional steps to remove, where possible.

The residue of flux may be merged within the solder joint in the form of channels and/or cavities, making removal of all flux residue, particularly from the immediate area of the solder joint, impractical and/or impossible. The inventor has further recognized that this flux may also be hygroscopic and increasingly corrosive as water is absorbed.

The inventor has created a strain relief for coaxial connectors which improves both the overall strength of the joint and the seal sealing properties of the strain relief upon the interconnection.

As shown in FIG. 1, an interconnection between an exemplary coaxial connector 1 and a coaxial cable 3 utilizes a solder joint 2 between the outer diameter of the outer conductor 4 and an inner diameter of an interconnection area 6 of the bore 8 of a connector body 10. A dielectric disc 12 may be applied to close the connector end of the interconnection area 6, thereby reducing the chance of molten solder egress from the connection area 6. As the solder pre-form melts and pools, an annular pre-form cavity 14 is formed between the resulting solder joint 2, inner diameter of the bore 8, outer diameter of the outer conductor 4 and a cable end of the connector body 10.

A strain relief 16 for the coaxial cable and coaxial connector interconnection may be formed by injection molding a polymer material to surround the interconnection with at least one contiguous polymer portion 18, for example as shown in FIG. 2.

The polymer material may be a thermoplastic material suitable for low temperature, low pressure injection molding, with resilient characteristics that is ultra-violet resistant and weatherproof. A suitable polymer material is polyamide; an exemplary polyamide material is Macromelt® OM 648, available from Henkel AG & Co.KGaA of Dusseldorf, Germany. Alternatively, any suitable low pressure injection molded thermoplastic adhesive may be applied.

Low pressure injection molding may provide suitable cavity penetration, without otherwise damaging the existing coaxial cable and/or interconnection. A preferred pressure range for the low pressure injection molding is between 5 and 40 bar. Similarly, the heat of the injection molding should be low enough to avoid softening the solder joint, damaging the polymer insulation and/or outer jacket 20 of the coaxial cable 3. A preferred temperature range of the injection molding is between 200 and 240 degrees Celsius. Alternatively, where the pressure and temperature of standard injection molding may be applied without damage to the cable and/or interconnection, such may also be applied.

The liquid injection of the polymer material during the injection molding fills the pre-form cavity 14, and seals against the connector body 10 and outer jacket 20, encapsulating any remaining flux and/or further filing any voids, channels 21 and/or cavities 23 that may be present in the solder joint, for example as shown in FIGS. 3-5. Thereby, the solder joint 2 and any flux residue is entirely encapsulated from moisture ingress that may corrode the metal surfaces and/or react with the flux residue to initiate accelerated corrosion of the metal surfaces and/or solder joint.

As best shown in FIG. 2, the strain relief 16 may be shaped to a desired coverage area, thickness and/or external surface configuration by the mold that is applied around the interconnection during the injection molding.

The strain relief 16 may be anchored upon a strain relief portion 22 of the connector body 10 of the coaxial connector 1. The strain relief portion 22 may be provided with a plurality of retention features, such as grooves, protrusions or the like. As best shown in FIG. 6, where the retention features are non-cylindrical, such as raised segments 24, an anti-rotation characteristic is provided which further increases the seal and/or retention of the strain relief 16 upon the strain relief portion 22. The strain relief portion 22 may be provided adjacent to a tool face portion 26 of the connector body provided with tool faces for receiving a hand tool or the like to hold the connector stationary as a coupling nut is threaded during interconnection of the connector with another connector and/or device. One skilled in the art will appreciate that where the raised segments 24 and tool face portion 26 are applied with a common geometry, anti-rotation benefits of the raised segments 24 are realized and machining of the connector body 10 may be simplified.

The strain relief 16 may have a cable portion 28 extending over the coaxial cable 3 which tapers toward the cable end, providing reinforcement to the interconnection which also tapers, such that the reinforcement provided by the strain relief 16 does not abruptly terminate at a rigid edge where the coaxial cable 3 would likely buckle if subjected to excess bending forces near the interconnection.

A cable portion 28 of the strain relief 16 may extend away from the interconnection over the coaxial cable 3 a significant length, such as a distance greater than three diameters of the coaxial cable 3.

In addition to and/or instead of a taper applied to the cable portion 28, the cable portion 28 may be provided with a plurality of stress relief grooves 30. The stress relief grooves 30 may be applied as generally elliptical grooves with a major axis of the stress relief grooves 30 arranged normal to a longitudinal axis of the coaxial connector 3. A spacing, width and/or depth of the stress relief grooves 30 may be adjusted to progressively reduce a bending resistance toward the cable end, further enhancing a tapered support characteristic, which while significantly increasing the strength of the interconnection, also protects the coaxial cable 3 from buckling proximate the end of the strain relief 16 due to any excess bending forces that may be applied, thereby increasing both the overall strength and the flexibility characteristics of the interconnection.

The strain relief 16 may alternatively be applied to coaxial cables 3 with corrugated outer conductors 4, including coaxial cables 3 with conductors of conventional metals, such as copper.

Where the corrugations 32 are annular, for example as shown in FIGS. 7 and 8, or helical, a portion of the outer jacket 20 may be stripped back to expose a portion of the outer conductor 4 between the connector body 10 and the outer jacket 20, along a longitudinal axis of the coaxial cable 3 and the polymer material applied covering the exposed portion 36 of the outer conductor 4. The exposed portion 36 may extend, along a longitudinal axis of the coaxial cable, for at least two trough-peak corrugations. That is, for a length containing at least two peaks and/or two troughs.

In this embodiment, instead of providing the polymer material sealing primarily against the outer jacket 20, an extended area of direct contact with the outer conductor 4 is provided along which the polymer material may directly interlock with the outer conductor 4, keyed to the outer conductor by the corrugation troughs 32. Thereby, any elasticity of the outer jacket 20, in particular where it is extending across corrugation troughs 34 of the outer conductor 4, and/or potential for the outer conductor 4 to move longitudinally with respect to the outer jacket 20 may be eliminated from these portions of the strain relief 16.

Alternatively, as shown for example in FIGS. 9 and 10, where the corrugations of the outer conductor 4 are helical, a continuous corrugation trough 34 threads around and longitudinally along the outer diameter of the outer conductor 4, between the outer conductor 4 and the outer jacket 20. During molding of the strain relief 16, the polymer material will enter the corrugation trough 32 where the outer jacket 20 abuts the pre-form cavity 14 or at a further position along the outer conductor 4 which the outer jacket 20 may be stripped back towards. The extent of polymer material fill along the corrugation trough 34 may be controlled by adjusting the viscosity of the polymer material, for example via formulation and/or temperature and/or the pressure applied during the injection molding. To provide a portion of supported outer jacket 20 with reduced elasticity characteristic similar to the exposed portion 36 described herein above, the corrugation trough 34 may be filled with the polymer material for at least one circumference of the outer conductor 4.

A corrugated outer conductor coaxial cable 3, particularly one utilizing conventional copper material, typically has a greater flexibility characteristic and/or resistance to buckling. Therefore, the cable portion 28 of the strain relief 16 may be applied with a generally shorter extent and/or thickness to conserve polymer material, for example as shown in FIG. 11. Further, the strain relief 16 may be provided with a streamlined configuration wherein an outer diameter of the polymer portion 18 is provided as generally cylindrical at a connector end and a tapered cone at a cable end.

One skilled in the art will appreciate that a strain relief 16 according to the invention may improve connector body 10 to outer conductor 4 interconnection strength and environmental seal. Thereby, prior concerns of flux residue contributing to accelerated degradation of the interconnection quality and/or environmental sealing of a solder joint 2 that may contain cavities and/or channels are reduced, especially where aluminum materials are being utilized. Thereby, the further adoption of aluminum material use in the coaxial connector and/or coaxial cable arts is enabled, which in turn may enable significant material cost savings for connector and coaxial cable manufacturers.

The strain relief 16 is also useful with non-aluminum conductor cables, such as annular or helical corrugated copper coaxial cable, as the presence of a strain relief 16, in addition to reinforcing the strength of the connector body 10 to outer conductor 4 interconnection, inhibits cable bending proximate the cable end. Thereby, conductor movements at a connection interface of the coaxial connector 1 which may otherwise contribute to the generation of passive inter-modulation distortion may be reduced.

Table of Parts 1 coaxial connector 2 solder joint 3 coaxial cable 4 outer conductor 6 interconnection area 8 bore 10 connector body 12 dielectric disc 14 pre-form cavity 16 strain relief 18 polymer portion 20 outer jacket 21 channel 22 strain relief portion 23 cavities 24 raised segment 26 tool face portion 28 cable portion 30 stress relief groove 32 corrugation 34 corrugation trough 36 exposed portion

Where in the foregoing description reference has been made to ratios, integers or components having known equivalents then such equivalents are herein incorporated as if individually set forth.

While the present invention has been illustrated by the description of the embodiments thereof, and while the embodiments have been described in considerable detail, it is not the intention of the applicant to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative apparatus, methods, and illustrative examples shown and described. Accordingly, departures may be made from such details without departure from the spirit or scope of applicant's general inventive concept. Further, it is to be appreciated that improvements and/or modifications may be made thereto without departing from the scope or spirit of the present invention as defined by the following claims.

Claims (9)

We claim:
1. A method for manufacturing a strain relief for an interconnection between a coaxial cable and a coaxial connector, wherein the coaxial cable is provided with an outer conductor, wherein the coaxial connector is provided with a connector body having a cable end and a connector end distal from the cable end, and wherein the cable end comprises a bore dimensioned to receive the outer conductor, the method comprising:
injection molding a polymer material around the interconnection including an outer diameter of the connector body and the coaxial cable proximate the interconnection, wherein the injection molding of the polymer material around the interconnection comprises filling a cavity formed between the outer conductor of the coaxial cable and an inner diameter of the bore at a strain relief portion of the connector body, wherein the cavity is bordered by a solder joint located nearer to the distal connector end than the cavity.
2. The method of claim 1, wherein the polymer material is a polyamide material.
3. The method of claim 1, wherein the polymer material is injection molded at a temperature between 200 and 240 degrees Celsius.
4. The method of claim 1, wherein the injection molding is performed with an injection pressure between 5 and 40 bar.
5. The method of claim 1, wherein the outer conductor has corrugations, the method further comprising stripping back a jacket of the coaxial cable prior to the injection molding, wherein the stripping back of the jacket exposes a portion of the outer conductor, along a longitudinal axis of the coaxial cable; and wherein the injection molding of the polymer material comprises covering the exposed portion of the outer conductor with the polymer material.
6. The method of claim 5, wherein the corrugations are annular.
7. The method of claim 5, wherein the exposed portion extends, along a longitudinal axis of the coaxial cable, for at least two trough-peak corrugations.
8. The method of claim 1, wherein the outer conductor has helical corrugations, and wherein injection molding the polymer material comprises filling a helical corrugation trough of the outer conductor, between the outer conductor and a jacket of the coaxial cable, for at least one circumference of the outer conductor.
9. The method of claim 1, wherein an outer shape of the polymer material is generally cylindrical proximate the connector end and a tapered cone proximate the cable end.
US14/661,483 2011-10-03 2015-03-18 Strain relief for connector and cable interconnection Active 2033-01-31 US9975287B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/251,341 US9108348B2 (en) 2011-10-03 2011-10-03 Method for molding a low pressure molded strain relief for coaxial connector interconnection
US13/633,218 US9024191B2 (en) 2011-10-03 2012-10-02 Strain relief for connector and cable interconnection
US14/661,483 US9975287B2 (en) 2011-10-03 2015-03-18 Strain relief for connector and cable interconnection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/661,483 US9975287B2 (en) 2011-10-03 2015-03-18 Strain relief for connector and cable interconnection

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US9024191B2 (en) 2015-05-05
WO2013052524A3 (en) 2013-06-13
EP2764586A4 (en) 2015-03-18
CN103843203B (en) 2016-10-26
WO2013052524A2 (en) 2013-04-11
EP2764586B1 (en) 2017-07-26
US20150190954A1 (en) 2015-07-09
CN103843203A (en) 2014-06-04
EP2764586A2 (en) 2014-08-13

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